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[PATCH] Send wireless netlink events with a clean slate 

Drivers expect to be able to call wireless_send_event in arbitrary
contexts.  On the other hand, netlink really doesn't like being
invoked in an IRQ context.  So we need to postpone the sending of
netlink skb's to a tasklet.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
hifive-unleashed-5.1
Herbert Xu 2006-08-03 23:54:41 +10:00 committed by John W. Linville
parent efe78cda35
commit 782a667511
1 changed files with 23 additions and 1 deletions
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24
net/core/wireless.c
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@ -82,6 +82,7 @@
#include <linux/init.h> /* for __init */
#include <linux/if_arp.h> /* ARPHRD_ETHER */
#include <linux/etherdevice.h> /* compare_ether_addr */
#include <linux/interrupt.h>
#include <linux/wireless.h> /* Pretty obvious */
#include <net/iw_handler.h> /* New driver API */
@ -1842,6 +1843,18 @@ int wireless_rtnetlink_set(struct net_device * dev,
*/
#ifdef WE_EVENT_RTNETLINK
static struct sk_buff_head wireless_nlevent_queue;
static void wireless_nlevent_process(unsigned long data)
{
struct sk_buff *skb;
while ((skb = skb_dequeue(&wireless_nlevent_queue)))
netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_ATOMIC);
}
static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0);
/* ---------------------------------------------------------------- */
/*
* Fill a rtnetlink message with our event data.
@ -1904,8 +1917,17 @@ static inline void rtmsg_iwinfo(struct net_device * dev,
return;
}
NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_ATOMIC);
skb_queue_tail(&wireless_nlevent_queue, skb);
tasklet_schedule(&wireless_nlevent_tasklet);
}
static int __init wireless_nlevent_init(void)
{
skb_queue_head_init(&wireless_nlevent_queue);
return 0;
}
subsys_initcall(wireless_nlevent_init);
#endif /* WE_EVENT_RTNETLINK */
/* ---------------------------------------------------------------- */